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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd9920099d898644a65e28226952799869a98e4399cc368de32a98ba2d9c2fee' 
  AND token = 'bJkSPG7qVa4DmkJKLWBKRgEzq30H5eMNfTcAXZhk4rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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