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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '344d2a1131b8e2f4d309cd82f32f24659c63e51979beb3eee7e6b29a024c66e7' 
  AND token = '2TG19/6sQuzEGpfX8PVOMas5r7Igj3up4WMWebsLY5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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