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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92392a612c34401fd5e984d7cad50199a4641e30f2a6da90d1837251eb07ea1a' 
  AND token = 'TzlbSlS6kx8sbEkj4HHtd/ExU25OEdJv7ZQfyh1LApo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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