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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bfdd338bffba77e45ba14d5a33113b4603428b3dbba0147605f53da37762de1' 
  AND token = 'uzJXHOvnHu/M/bbo+FR82o4/HmbPrYl6mPpKRwnMAqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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