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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a5c6b976067e53afa5ffde5a6aa948aa6c0f56a8b43b0fbdd9e8634cd7ee741' 
  AND token = 'Y+dceQPtF5l90+GC4oONnX/fTwP/TG8oDqb4KBURwAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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