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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7c7d960cada9df267ebbcca8edcde348c7aeb0b878dd79b5512ca78d26edc23' 
  AND token = '7VWDx/oFxV6YT5wX9e4ZjLZB37QMg6LxhrABbTnhoL0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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