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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b339cdefc56a26cdb323665cc0b09f44e9e63ee9fdd82ec9c0386412ef12f47f' 
  AND token = 'I5DCAjVFi+fHO5uL8saBaKxbknxR/MxNzyMvcwoZrn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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