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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '45bb6b1403f844db9299b4acaeb9c06f53e157eb068bdf628d3aa72bd228ae34' 
  AND token = '83drPKwrC7QJw4MNpBseTU/Z7AeB7ddl9DaYpyjdEv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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