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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d9f0cb2ded3f9967dbd6f0449dffaf4cf0b41996957ef97211c3fd51e5b6ff9' 
  AND token = 'F0RXGgqKKB7V9RhacDpp7HXLLH7bThC4kgxCsUnbsvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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