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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '177b7db621cad116f6da2bef924243050cd8b9094e7440e22e0c0cab688064ef' 
  AND token = 'jaUZuCoqRX8+qW2DGsUOAkv0Fa+A/EvY/jIJeuPRXUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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