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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2796eb98e8ebe90a20a15fa2a526c4b13b8a4f4eb63145b412f30fc4ba7d4490' 
  AND token = '8PEaAUVLzv2LIlRIFfeVDIgYgirjarYbyEb3NrZf7dM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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