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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6306334318c2065a3281e94f9cf0adddb9edf681764e19b1a87047b0910e7a4d' 
  AND token = '4Db7mwvS9nfeyuSDPn2EUCpPn55mIRtPSBIXQFKs7XU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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