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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa28eca36a0b23e593120bacf882240b627c6f653a797be1b1eb585e6a0971b1' 
  AND token = 'qQskbI4a9CPzKdcspcsy8etq6/0OpEYxPRNfaELJC3A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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