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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '569a2c87f329f9649f9202690df401181fa7006dae30ba5001eb2619cc22a652' 
  AND token = 'kg3HETNIh7otIxAG0ZADyDeF1FP3CQBKVVl1UQbEt4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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