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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ffdaa584e18b88394b9620b24874142be48d978d0498f6c3a602fd7ff6570fe' 
  AND token = 'aA2eAd9FJGfNT+7Y1R1QnKEi0+oPoBsiO8WUCjEQVOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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