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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd841319f0b343099a5ac82c047457b3605aed8894590eb44bf583f98894b3e2' 
  AND token = '3u6ReWsxEfjYIuc9AFCaiVSbj0HCD9IkltOtWOqmwPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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