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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83722fea12eea5381631e2e333e7d7ad94942e9a72c9a418cf78fe3745921bae' 
  AND token = 'eKjzP5Ph3pCpWNi9K6T3qHSduYWpN300jcTKk1Vx5x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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