SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '180bdad6c6d4dbbc7caf169d52c7b212ee87577189997a9f17285315e3c862fd' 
  AND token = 'Gz47VQcV48v6jLJLyoHN3IxkJhrjs+RPAmwaISuu9OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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