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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc907bb874b323b6d9064b04e3044bf64f6d8b8065d67a5f76f0d0a8431b1d97' 
  AND token = 'H16Qs/pb5bPkqiKjo/YViY8yUMr5RXNEy2ZQS7T3CRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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