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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '706345a944ae609daddf9f160ce154621e5c274d3f35fc43428ffb65aad9e573' 
  AND token = 'p+Baimg9ZLyo+MyHoE1527xGg3DFAmTLcaV2y10YY4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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