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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ce35d4d71e67dc5c5214b7d9a3a4392477f778a4dae26e2882c656fa23e2b16' 
  AND token = 'wM4IJWnr1FJZtAuoDu160zpUqcps/rJzyOKmBDc5J7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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