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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b665c46cb756fab4a73ecb842fde5f7cea9bf0d8e775e9dfaa093119a7174ff' 
  AND token = 'wA41NIwe4hrnmEmalVgYr7Dwd6R/s1/dEtUUJ1Jf3Tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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