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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd90c9bcb9a3b6f05a65f9d9efd3b3c207535023dd10faa41d49d5a8dd4e9b24' 
  AND token = 'tY7N5kWlGODalRTV9sGsXJr5QuscYRD0upuoxn5dwZ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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