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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ab2a72b3e96af5411e139b816f74ca802cfc34ab80752f31aa593b577fa4ab7' 
  AND token = 'td620q6xO+iIXkl2AzBfFJwcIOSetz8V2BQ+Hpa4kdU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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