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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '856e8c9ea79f1224a402f4f9387b45e0001e7fe712a5fe49dd5f5dcfd6111875' 
  AND token = 'UWovo5h8VzlUTAo03fKoap+cjttvlK36Y0o9Gc3wnB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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