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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09b68626f5fc2589cce8a042df3bff268203bb6e055b9d7f80ab7d2c36ead740' 
  AND token = 'zrZI1Lvz0dSXl9gTx2RkZnsT3Mp3JseAx1HnhvTb4xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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