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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f3a066e90f120b91a6e7e5c669ebfb50716e30a22fa8f8075986c937860c8bc' 
  AND token = 'CPm9Z+1nczkLgUn1eIQIAtj0KdTE9wl7aKebAcNULwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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