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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b323690fabb5b782a8ed71d6835782b27a893c2e93055024071a21871fb1c1d8' 
  AND token = 'eDpGv/sli9fRP7fvZqPnH4qu3kCGb6pK1UV7U5praWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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