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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ada6678dd70f0f39d9a5aeeb1e8c9c183900022ad22564c6f4e8d64567ed0d54' 
  AND token = 'pCdd2zYEXceYB5rRyFJ82VoXIqciq00Ej6rsQ8iDuRg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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