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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11929239d19d928d4161726b214d20a45c7aa9879d3e0f1a3745f54de07d3878' 
  AND token = 'MoneKYsDINI7jLitM1WGiA1yT+IvKH6nl0AjClfAFRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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