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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00509c4c520c7dff0b1691de6f8bf6b365aa3f28fc8a5f62c248e92e0ac57267' 
  AND token = 'rBBWMwbEDO41PJwO/7bysuDzNs0OaIxd6DsutkM4j80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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