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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adfd4a43aaf48d45fc97b9e340a3a1633e950ebacd170021897c629158ddd64c' 
  AND token = 'SiCl+qo0ic834BeoxabV3XvYOEbCa1Rp4p2qwbQljAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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