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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e7fe77bd2b3691964cc0cf57c83297ecc2dd9df898953c3043432aa061d4d6e' 
  AND token = 'y1osUoZWXgz9m0D+xkVnCPYB55YsoldSTgvb1XDh54o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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