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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a74ec6b430acde4608d7d9b66486aa03b2e7406b4b885e8b417aefe0ac1f3b56' 
  AND token = 'NLEzz/KL630MxR3SZfQ9ASV28XA/E12pB78TcM+cTyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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