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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666cebe4ba162cea6a88bc9316e02b1c40e164cedd44b67022222e9ae355c95a' 
  AND token = 'hF4dd6zuSJ6a083aYitEPW4An1rHglqi/d2CnRCXd9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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