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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f53c910d48ce47ff15ce02dd21c0873549c9425e18ebfa6f4bd72fc30f66e63b' 
  AND token = 'uZyeA+DzHUQHd4I1YOIE4VcKJyP9ygoTUPkKfyNeuig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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