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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b736a81f013534123f976962a82e3d3a8b267d4bded558bd5279b94584400839' 
  AND token = 'zG9TR2ee+m0g4mgG8jsKNZFEjLtWF95oR3PM7N+pa8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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