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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3609a1819679e7e7893080c524f7b67c6f12c44da2b1130c77519b5326795279' 
  AND token = '34d2cQecdEuketDsCNBQDTY31nss/0I91Js2u7I41W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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