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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14ddffb134f89ff8d59ff87e42c1fdfb28d597c08a44cfe1a429ca0ec9dfd2e3' 
  AND token = '5RjvGyJyPfUdPVHHJGpxeMOs6n/foKqp49XaNDXDZds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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