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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c26ac6ecc37169118bb77670fa7404657c5c251e29cf4c697d601b5c543056b' 
  AND token = 'm4cUF2HOI7FI3wI9TbkHaVvfbuB70fsg0xUSx+XYsHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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