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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd651d2c9a1ee8d854c3ccaf1cd0f6c7f78570840c37afffe3ae8eee89b4c3dc1' 
  AND token = 'lbkglvgGpgCUF6sqFBaTqwKTJMguwqv36pcGSfU645Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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