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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e237b7cca43ecf833e40d40bc6d110d631e0ce2a24bc0cbedd2cec63f7b31a0' 
  AND token = 'KURUhonv1+tQCYkdkpP9bTwCPsZLc7wxUMo//iFtsaY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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