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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '710ea8ba5d2c48056e3804e29be29b7d6aeb67b2a6db43641be3ddddc3c10997' 
  AND token = '6QXP6zPWBdw5Y5jUoKCR2XbcN9mJVn8atC9Ulx6TCSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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