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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2292ad31bdc2a7c03196dfe15a66b2dcace62009da7f06fe7aa02fe9a9bbf3af' 
  AND token = 'pYO7TnVByI14c96LvW/OQMu0qfv1FjD1P8ZMkcKUYsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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