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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '838c9f273c364d91c546c3af8c9012151d84e0405d3cfad6ebf00d9ba265b5ad' 
  AND token = 'GS+rh25mZP6vJF4YeKCDN5x6Wk4lQflF83SbqUrz6NY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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