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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e885cd7700c5bb14a9644676b95a5bfb989694ef7828dcb2ba1604908b6c6371' 
  AND token = 'y3bzbF2JHviqMSF/0TXVcihACrUlQa71MrkKG+1cqPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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