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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02438dfc5ef6302b4cb3c02b728c3b2aa59e74353efaa004eda434e5e368d52a' 
  AND token = 'H45C2BEM7YDQxkz0z2IT0HFjdrN/ky+8JxiiW+NBDWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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