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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9bf91abbc9845fd3d8399f78d18ae496cf1394f7ce321f7a2ea17084bd7a340' 
  AND token = 'Ncb6svk7YkWRkTURbH2uFV7IEDG8cShuJUFp1cEwEdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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