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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745e64978ec3c4051e637d8af44441c8b5c2b3dfb1144dc8ec7b549763f7ef83' 
  AND token = 'O6uRbYp/oDWtJ/pv8PcvAvJs28Yb1womWSvCXORnfuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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