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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c498e9b8e60f8d73a51f94d860807064aab6af51f632afc97eebb152abd7d63' 
  AND token = 'cEzlllA2udK9R/GtQkYPGRhgNYaKb/LFf3GCDNz6GlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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