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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '360043fb65b5a2acb18f5f62c27933593b6d31c7b1a4b90872f519e877c4ebb7' 
  AND token = '7Z8vCeh9f/jLT5f8BIrmnihcFTEgp9RaHBYvV8aQY1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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