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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ae4ab331007152f3c4be4f53480ce3321b9b98fb7a3746ed313ccff9189cb4' 
  AND token = 'TFFPDHV5rsBbWVly84oJCKnLLUW5f9wux/B5cXdWblo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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