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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84f149d1816e4cd9d968a04c545950531664926951ffad4bd75bc6aa3b7e2986' 
  AND token = 'QXdAD9wk8rUeWQ4hLUOM1XY0L0zLo7SoQ3996gD8JLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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