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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7008bc4ee21247b5c1d47f9a822ea7487b908a23d20a460bf758724d4efd18db' 
  AND token = 'LfR2Om9G/hAGvyvmeXNT91J4FDBjd1WskMKo38J/PvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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