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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9355d2c156e39af9698e86cecfedb2259c95368c60b1d750fa7bcbe65eb602b2' 
  AND token = '2YBgO7kQYeWbf4Te6d9fxXTa3elH4y6SCnXoNscfUKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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