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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949584bbe626acd979c607007f3f98ec6626dd169b0b32905b33b6c67380e7d6' 
  AND token = '4er0GUNtzQX09r8zEB+yPXwm+tTZRmirPNelqx2CKD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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