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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61943130eb267984cf15e9116e702105509d6df4d612e954acbadd9cd437c208' 
  AND token = '5q18Q5vNdjasGEsqXYab38xeJrrAsguzjT92SaxsTX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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