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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24f9df6cd51367a43cfe1a3ace0d411c556d4cd9520374025533daf934b28432' 
  AND token = '3qPlnrt2pTDgw+Tc9dEZ/FFfKPcr+UPwHDnIvF85jKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}