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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b8dd00480e455bca10ef7db42fa825723e9b5c728466ba438388e2f45517b7' 
  AND token = 'UdIQYkrD4NUbgETNHK0TgBuGCN5KL8+qX/WTgjFiR5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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