SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13307d281795fa229ae85ecfc352484c0d8d3ca0e640d9422bf20b10be35fc79' 
  AND token = 'NoKjY2RjzVoRFHlqjGYDB3LglJA0J+wPyqWSEEXndYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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