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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86b6e5d74e16dced92a8a58a7354c6692d4255c20094340ab42c49f6a89d01bc' 
  AND token = 'DnufnfMygpjgELd4Y3qcDt5SByOetSIYhvr+LqXfrxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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