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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0377acda2809e02212810c0c38020f46fda87a7083583ed83eaa6bff24424af7' 
  AND token = 'FMpNQ7t8OkqUE7Hu9oAwPXz1cksIIxANSG6Da+OCGis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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